diff --git src/wp-admin/css/admin-menu.css src/wp-admin/css/admin-menu.css
index b8bf6b2..befab94 100644
--- src/wp-admin/css/admin-menu.css
+++ src/wp-admin/css/admin-menu.css
@@ -7,7 +7,7 @@
 }
 
 #adminmenuback {
-	position: absolute;
+	position: fixed;
 	top: 0;
 	bottom: 0;
 	z-index: -1;
@@ -919,4 +919,3 @@ li#wp-admin-bar-menu-toggle {
 		top: 46px;
 	}
 }
-